Notes on the Network Working Group meeting, Urbana, Illinois, February 17, 1971
RFC - Unknown
(February 1971; No errata)
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RFC 101 (Unknown)
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Network Working Group Richard W. Watson
Request for Comments: 101 SRI-ARC
NIC: 5762 February 23, 1971
NOTES ON THE NETWORK WORKING GROUP MEETING
Wednesday Evening, February 17
Mike Sher opened by welcoming the group to Urbana and briefly
indicated that ILLIAC IV was expected to be running this summer. The
ILLIAC IV Project has been split into two projects; one on basic
system hardware and software, and the other on applications. Their
IMP is not yet connected to their PDP-11.
Steve Crocker asked for topics to be discussed at this meeting; these
are indicated below.
Peggy Karp of Mitre has been summarizing the old RFC's. She has a
list of about 30 topics and is summarizing their present status. She
expects to finish around the end of February. See RFC #100,
NIC(5761). It was suggested that someone write an RFC indicating
which ones are obsolete. It was also suggested that the Network
Information Center (NIC) help sites in organizing their hardcopy
There then followed brief discussions of experiences in using the
Network. John Melvin (SRI-ARC) summarized SRI's experience in using
the Utah PDP-10 to help in SRI's transfer from an XDS 940 to a PDP-
10. In April-May 1970 it was clear that SRI was headed toward a
PDP-10 in order to have the capacity and reliability to fulfill their
role as the Network Information Center. They had had some previous
experience in connecting with Utah, and so it seemed logical to try
to use the Utah 10 to aid the transfer.
In June use of the Network began. SRI uses higher level languages
extensively, so the first task was to transfer the compiler-
compiler Tree Meta. Source code was generated on the 940 to run
on the PDP-10. Binaries were then transmitted to Utah and run and
debugged. Patches were performed where possible, and source
changes accumulated. A new source and binaries would then be made
Watson [Page 1]
RFC 101 NOTES ON THE NETWORK WORKING GROUP MEETING February 1971
Once Tree Meta was running, a new high level language (called L-
10) for programming the On-Line System (NLS) was implemented in
the same way. When L-10 was running the core device independent
parts of NLS were rewritten and debugged. NLS was completely
reorganized during the transfer.
At the SRI and Utah ends a control program allowing three users to
connect to Utah was written, which ran as a user process and
allowed character interaction and files to be transmitted. The
scheme worked well and much useful work was accomplished in the
July--December period with some people on 4-5 hours per day. The
voice link was used when something would go wrong in trying to
determine where the problem existed and to reset. At times they
would go 2 weeks with no problems. SRI has an IMP interface
diagnostic which ran as a T/S process.
Generally, echoing was handled at the SRI end. DDT was used at
Utah end. Round trip character delays of 4 seconds were not
uncommon, and at certain points delays of 8 or 10 minutes were
experienced. These delays were the result of the implementation
used which involved multiple processes at each end, each to be
scheduled. Utah was heavily loaded at 2:00 PM and the SRI people
took to running at night and on weekends.
When the SRI PDP-10 came in in December, use of the Network
Users would have liked a more constant response time instead of
the widely varying one so that their work habits could adapt to it
even if it was slow.
Gerry Cole reported on some results of measurements made during the
SRI-Utah work. Measurements were also made at SRI to help in
interpreting the data obtained by UCLA. Gerry wrote a paper
summarizing these statistics which is available from him care of SDC.
Gerry requested that when people are set up to use the Network,
they inform him so that he can gather statistics. UCLA will
eventually have a program to scan the Network for utilization, but
if people could tell him when they were going to use the Network,
it would be easier to measure meaningful things and interpret the
data from a knowledge of type of usage.
Bob Kahn indicated that BBN is interested in the Statistics on
overall flow to see if the Network is configured properly. Gerry
said that UCLA is interested in the statistics for Network modeling
studies. Measurements are taken by remote control by use of a
feature designed into the IMP's by BBN for such a function.
Watson [Page 2]
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